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What is the radian measure of a right angle?

Answer and explanation

Correct answer: π/2 radians

The governing conversion is 180° = π radians. A right angle measures 90°, which is exactly half of a straight angle measuring 180°. Consequently, its radian measure is half of π: 90 × π/180 = π/2 radians. Therefore option B is correct. The alternatives correspond to other standard angles. π radians represents 180°, a straight angle; π/3 radians represents 60°; and 2π radians represents 360°, one complete revolution. A reliable way to check the result is to remember the benchmark values 90° = π/2, 180° = π, and 360° = 2π. Since a right angle is one quarter of a full revolution, it must also equal one quarter of 2π, which again gives π/2.

Related tags

Trigonometric-FunctionsAnglesRadian-MeasureClass-12Trigonometric FunctionsMathematicsClass 12 Mcq

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